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v. guard·ed, guard·ing, guards
a. To watch over (a place or person, for example) in order to keep from being damaged, robbed, or injured: guard a bank; guarding a witness. See Synonyms at defend.
b. To supervise the entry and exit through; keep watch at: guard a door.
c. To watch over so as to prevent escape or violence: guard a prisoner.
d. To keep from risk or curtailment; ensure the safety or integrity of: jealously guarded his success; carefully guarded her privacy.
2. Sports To keep (an opposing player) from scoring or playing effectively, usually by remaining close to the player to disrupt offensive play.
3. To maintain control over, as to prevent indiscretion: Guard what you say.
4. To furnish (a device or object) with a part that protects people from harm or injury.
5. Archaic To escort as a guard.
1. To take precautions: guarded against illness by getting exercise.
2. To serve as a guard.
1. A person who protects, keeps watch, or acts as a sentinel: a prison guard.
a. The act or duty of guarding.
b. Protection; watch: The sheepdog kept guard over the herd.
3. Something that gives protection; a safeguard: a guard against tooth decay.
4. A device or attachment that prevents injury, damage, or loss, especially:
a. An attachment or covering put on a machine to protect the operator or a part of the machine.
b. A device on a foil, sword, or knife that protects the hand.
c. A padded covering worn to protect a body part from injury: a shin guard.
d. A small chain or band attached to a watch or bracelet to prevent loss.
e. A ring worn to prevent a more valuable ring from sliding off the finger.
5. An honor guard.
6. Chiefly British A railway employee in charge of a train.
7. Football One of the two offensive linemen on either side of the center.
8. Basketball Either of the two players normally positioned in the backcourt who are responsible for bringing the ball to and initiating offensive plays from the frontcourt.
9. Sports A defensive position or stance, as in boxing or fencing.
10. Electronics A signal that prevents accidental activation of a device or ambiguous interpretation of data.
off (one's) guard
Not alert; unprepared.
on (one's) guard
Alert and watchful; cautious.
stand guard
1. To keep watch.
2. To act as a sentinel.

[Middle English garden, from Old French garder, guarder, of Germanic origin; see wer- in Indo-European roots.]

guard′er n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
But the guarder of the relic only seemed to turn his head by the smallest section of the compass.
Summary: Siliguri (West Bengal) [India] August 11 (ANI): A portion of National Highway 31D's railway flyover guarder collapsed in Goaltuli, Siliguri early Saturday morning.
The dog was labelled an aggressive resource guarder who could not be trusted around children or other dogs and only could be with people who were fully apprised of the dog's shortcomings and would keep the dog in check.
After some chapters, the reader is given brief histories about Team Tomorrow, the story of the comic and its characters Gargantua and Green Guarder, Kirks favorite.
A Dios plega que esta llegue a vuestras manos antes que la mia se vea en condicion de juntarse con la de quien tan mal sabe guarder la fe que promete" (1.27:336; my emphasis).
"Real estate is considered a guarder of value and a hedge against inflation and currency weakness," he added.
I recommend tethering the guarder (Dog A), and having a second handler approach with Dog B on a leash to prevent him from coming too close to Dog A.
Hundreds of Eritreans risk their life to sneak out the heavily guarder Eritrean borders where there exists a shoot to kill policy against any citizen trying to cross the border.
ki sul la porte puet guarder, The castle stood on a tall cliff, mar i avra dute ne reguart near by the sea.
Challenging a resource guarder will always ultimately fail and result in someone getting bitten.
Deputy Prime Minister also said that postponing the retirement of security chiefs was intended to prevent the paralysis of the military institution, which is the only supporter for the country and security safe guarder. "I am not against the nomination of new security chiefs, but we cannot risk the military institution paralysis in the absence of agreement," concluded Mokbel.